A real-life Hell. The Western Front, 1915. Death is everywhere. But in the confusion of combat, young American volunteer nurse Agnes Frocester witnesses something utterly unexpected. A murder. Amid the half-truths of a British Army enquiry, she takes matters into her own hands. While an innocent man faces the firing squad, Agnes's investigations take her and her friends into the intrigue and espionage of a secret war, and the blood and terror of the battlefield. Into the bohemian heart of Paris, and across war-torn Europe - - into the most deadly places on earth.